wrapper: Use calloc instead of zerostructp

Signed-off-by: Jakub Jelen <jjelen@redhat.com>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>
(cherry picked from commit c85268c38b)

src/wrapper.c

@@ -154,11 +154,10 @@ struct ssh_crypto_struct *crypto_new(void)
 {
     struct ssh_crypto_struct *crypto;
 
-    crypto = malloc(sizeof(struct ssh_crypto_struct));
+    crypto = calloc(1, sizeof(struct ssh_crypto_struct));
     if (crypto == NULL) {
         return NULL;
     }
-    ZERO_STRUCTP(crypto);
     return crypto;
 }